Driving-gear for locomotives



(N0 Modeli) D. S. PATTERSON. DRIVING GEAR FOR LOCOMOTIVES.

Patented June 6, 1893.

W/TNESSE @f mgw a /1 UNITED STATES PATENT O FICE.

DAVID S. PATTERSON, OF NORTH PLATTE, NEBRASKA.

DRIVING-GEAR FOR LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. 499,034, dated June 6,1893.

Application filed January 7, 1893.

To all whom it may concern:

Be it known that 1, DAVID S. PATTERSON, a subject of the Queen of GreatBritain, at present residing in North Platte, in the county of Lincolnand State of Nebraska, haveinvented a new and Improved Driving-Gear forLocomotive-Engines, of which the following is a full, clear, and exactdescription.

The object of the invention is to provide a new and improved drivinggear for locomotive engines, which is simple and durable inconstruction, and arranged to prevent horizontal straining of the axlejournals, and pounding of the wheels on the rails whether caused by thecentrifugal force of a single main connecting rod, a single parallelrod, or a single crank pin, or by the angular thrust of the mainconnecting rod.

The invention consists of a front and a rear cylinder arranged onopposite sides of the driving wheel, and connected by their pitmen withcrank pins located on opposite sides of the center of the driving wheel.

The invention also consists of certain parts and details, andcombinations of the same, as will be hereinafter described,and thenpointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a side elevation of the improvement as applied on alocomotive having double driving wheels. Fig. 2 is a plan view of thesame. Fig. 3 is' a like view of the improvement as applied onalocomotive having single driving wheels; and Fig. 4 is an enlargedsectional plan view of the driving wheel on the line 4-4 of Fig. 5; andFig. 5 is a sectional rear view of the same on the line 5-5 of Fig. 4.

The improved driving gear is provided with the two engine cylinders Aand B, provided with the usual pistons and cross heads connected bytheir pitmen or connecting rods C and D, respectively with wrist pins Eand F, respectively, arranged at opposite sides of the center of thedriving wheel G, as plainly shown in the drawings. Each of thesecylinders will only be about half the usual size.

The wrist pin E is preferably formed at its outer end with a crank armII, extending di- Serial No. 457,648. (No model.)

ametrically on the face of the drive wheel G and carrying at its outerend the outwardlyextending wrist pin F connected with the other pitmanD, as above mentioned. As shown in Figs. 4: and 5, the wrist pin E isformed or secured at its inner end on ablock E preferably madetriangular in shape and fitted into a correspondingly shaped apertureformed in the web of the driving wheel G. Set screws I screwing halfinto the web of the wheel G'and half into the block E, serve to hold thelatter in the proper position in the wheel.

In case the locomotive is provided with a second pair of driving wheelsJ, then the wrist pin E is made sufficiently long to permit a pitman Kto engage the said wrist pin in addition to the pitman O, as plainlyillustrated in Figs. 1 and 2. This pitman K is connected pith a wristpinL on the second driving wheel J, and the other wrist pin F of thefirst drive Wheel G is connected by a pitman N with a wrist pin 0 heldon a crank arm P attached to the outer end of the wrist pin L. Thisdouble wrist pin 0, L, and crank arm P are similar to the double wristpin F, E, and crank arm H on the first driving wheel G.

It will be seen that when the motive agent is admitted to the cylindersA and B simultaneously, their pistons travel in opposite directions, sothat one of the pitmen C or D pushes rearward on its respective wristpin while the other pushes forward and vice versa during the lower orupper half of the stroke. By this arrangement all horizontal strain onthe journals or the axles of the drive wheels G and J is prevented, andpounding of the drive wheel on the rails is obviated on account of thepressure on the two crank pins E and F, being simultaneously on theupper and lower halves of the stroke, for each revolution of the wheel.

It is understood that the block E may be of any other desired form thantriangular, as stated and shown in the drawings.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent' 1. A driving gear for locomotive engines,comprising a front cylinder, a rear cylinder, the cylinders beinglocated on opposite sides of the drive wheel, and wrist pins located onopposite sides of the center of the drive wheel, and connected with thepitmen of the said engine cylinders, substantially as shown anddescribed.

2. In a driving gear for locomotive engines, the combination with adrive wheel having in its web a transverse aperture, of a block securedin the said transverse aperture,awrist pin formed or secured on the saidblock, a;

crank arm attached to the outer end of the wrist pin and extendingdiametrically of the drive wheel, a second wrist pin projecting from thefree end of the said crank arm, and pitmen connected with the said wristpins and forming part of the engine cylinders arranged on oppositexsidesof the said drive: wheel, substantially as shown and described.

3. .A driving gear for locomotive engines comprising a front cylinder, arear cylinder, the said cylinders being located on opposite sides of thedrive wheels, wrist pins located on opposite sides of the center of eachdrive Wheel, a crank arm for connecting the two wrist pins of onedrivewheel with each other, cylinder pitlnen connected with the wrist pins ofone drive wheel, and parallel pitmen connecting the wrist pins of onedrive wheel with the wrist pins of the other drive wheel, substantiallyas shown and described.

hi DAVID s. x PATTERSON.

mark

Witnesses:

JOHN W. LEMAsrERs, ISAAC A. :SABIN;

